Why do others die in various accidents when they time travel, but when I time travel, I just fall into the sewer? Who the hell stole the manhole cover! ! Why are other people's golden fingers who time travel so fancy, but I only brought a bag of high school textbooks and homework with me when I time travel? Textbooks are nothing more. In ancient times, I could still be a scientist, but this is the future. What's the use? If there are time stamps, they can be sold as antiques. If they are so new, are there such antiques? 1. The stupid author is writing for the first time, please bear with me. 2. The writing is bad, maybe a hidden Mary Sue. The stupid author just wants to write about his own imagination. 3. The stupid author probably has a soft heart (because he doesn't know it).